Fix invaild gitter url (#4125)
Fix invaild gitter url (#4125)


airbnb/caravel,dmigo/incubator-superset,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/caravel,dmigo/incubator-superset,mistercrunch/panoramix,airbnb/superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,dmigo/incubator-superset,dmigo/incubator-superset,mistercrunch/panoramix,timifasubaa/incubator-superset,airbnb/superset,timifasubaa/incubator-superset,zhouyao1994/incubator-superset,timifasubaa/incubator-superset,airbnb/superset,apache/incubator-superset,zhouyao1994/incubator-superset,apache/incubator-superset,apache/incubator-superset,mistercrunch/panoramix,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/superset,timifasubaa/incubator-superset